/*
 * Copyright � 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Globalization;
using Spring.Collections;
using Spring.Util;

namespace Spring.Objects.Factory.Config;

/// <summary>
/// Simple factory object for shared <see cref="Spring.Collections.ISet"/> instances.
/// </summary>
/// <author>Juergen Hoeller</author>
/// <author>Simon White (.NET)</author>
[Serializable]
public class SetFactoryObject : AbstractFactoryObject
{
    private ISet _sourceSet;
    private Type _targetSetType = typeof(HybridSet);

    /// <summary>
    /// Set the source <see cref="Spring.Collections.ISet"/>.
    /// </summary>
    /// <remarks>
    /// <p>
    /// This value will be used to populate the <see cref="Spring.Collections.ISet"/>
    /// returned by this factory.
    /// </p>
    /// </remarks>
    public ISet SourceSet
    {
        set { this._sourceSet = value; }
    }

    /// <summary>
    /// Set the <see cref="System.Type"/> of the <see cref="Spring.Collections.ISet"/>
    /// implementation to use.
    /// </summary>
    /// <remarks>
    /// <p>
    /// The default is the <see cref="Spring.Collections.HybridSet"/> <see cref="System.Type"/>.
    /// </p>
    /// </remarks>
    public Type TargetSetType
    {
        set
        {
            AssertUtils.ArgumentNotNull(value, "value");
            if (!typeof(ISet).IsAssignableFrom(value))
            {
                throw new ArgumentException(
                    string.Format(CultureInfo.InvariantCulture,
                        "The Type passed to the TargetSetType property must implement the '{0}' interface.",
                        typeof(ISet).FullName));
            }

            if (value.IsInterface)
            {
                throw new ArgumentException(
                    string.Format(CultureInfo.InvariantCulture,
                        "The Type passed to the TargetSetType property cannot be an interface; it must be a concrete class that implements the '{0}' interface.",
                        ObjectType.FullName));
            }

            if (value.IsAbstract)
            {
                throw new ArgumentException(
                    string.Format(CultureInfo.InvariantCulture,
                        "The Type passed to the TargetSetType property cannot be abstract (MustInherit in VisualBasic.NET); it must be a concrete class that implements the '{0}' interface.",
                        ObjectType.FullName));
            }

            this._targetSetType = value;
        }
    }

    /// <summary>
    /// The <see cref="System.Type"/> of objects created by this factory.
    /// </summary>
    /// <value>
    /// Always returns the <see cref="Spring.Collections.ISet"/> <see cref="System.Type"/>.
    /// </value>
    public override Type ObjectType
    {
        get { return typeof(ISet); }
    }

    /// <summary>
    /// Constructs a new instance of the target set.
    /// </summary>
    /// <returns>The new <see cref="Spring.Collections.ISet"/> instance.</returns>
    protected override object CreateInstance()
    {
        if (this._sourceSet == null)
        {
            throw new ArgumentException("The 'SourceSet' property cannot be null (Nothing in Visual Basic.NET).");
        }

        Set result = (Set) ObjectUtils.InstantiateType(this._targetSetType);
        result.AddAll(this._sourceSet);
        return result;
    }
}
